I have been running HD300 on stock or tow setting and decided to try Performance a few days ago and im already up 1mpg on the lie o meter half way through a tank of fuel. So i will be filling up here soon and run through a whole tank on performance and i will see how much better it will be. Key is to run high power tune and keep your foot out of it(keep boost low)

Tried the HD300 tune on hot. Retaught the tranny. Snap this thing's a monster! It throws a P0703 code. I found the issue on here about why it sets that code and kills the cruise control. Any way to get around that? Thanks again.

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